I get this exception when reading data, what can be done to fix this
problem?

java.sql.SQLException: fetch problem:
org.firebirdsql.gds.GDSException: arithmetic exception, numeric
overflow, or string truncation Cannot transliterate character between
character sets at
org.firebirdsql.jdbc.FBResultSet$FBStatementFetcher.next(FBResultSet.java:2514)
at org.firebirdsql.jdbc.FBResultSet.next(FBResultSet.java:157)
at client.ClientConnect.queryBytes(ClientConnect.java:204)
at client.EnvVal.getEnvBytes(EnvVal.java:91)
at client.EnvVal.getEnv(EnvVal.java:101)
at client.ClientMain.<init>(ClientMain.java:394)
at NewsSIEVE.main(NewsSIEVE.java:16)
java.sql.SQLException: fetch problem:
org.firebirdsql.gds.GDSException: arithmetic exception, numeric
overflow, or string truncation Cannot transliterate character between
character sets